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8.0

How to make complex IF validation

Asked by fyver528 in Microsoft Access Database

Tags: access, validation, bookings

I am trying to make a charter booking system...
 
Relevant tables for this validation:
 
- Chartersbooked (includes when the charter is booked for)
- Skippers
- Boats
 
I need to have a validation statement where if a dropdown box is set to "full day" you cannot book another charter with the same boat and skipper for that day.
 
Additionally there are half day morning and half day afternoon settings where it is essential that you can book with the same skipper and use the same boat in a new booking for the opposing option (i.e. if half day morning charter is booked for a certain day, then in the afternoon for that same day, a booking should be allowed with the same boat and skipper)
 
I think that all I need is a statement that does the following:
 
IF "Full day booking" ON [date chosen] the [boat chosen (in booking form)] = [boat chosen (already booked)] AND FULL DAY
THEN refuse booking
ELSE

IF "Half day morning" ON [date chosen] the [boat chosen (in booking form)] = [boat chosen (already booked)] AND "half day afternoon"
THEN allow booking
ELSE

IF "Half day afternoon" ON [date chosen] the [boat chosen (in booking form)] = [boat chosen (already booked)] AND "half day morning"
THEN allow booking
ELSE refuse booking

I really have no idea how to string together large statements like this in Access.

Thanks for your help in advance
[+][-]02/17/06 08:52 AM, ID: 15982270Accepted Solution

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About this solution

Zone: Microsoft Access Database
Tags: access, validation, bookings
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Solution Provided By: nico5038
Participating Experts: 2
Solution Grade: B
 
[+][-]02/09/06 02:05 AM, ID: 15911044Expert Comment

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[+][-]02/09/06 06:06 AM, ID: 15912625Expert Comment

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[+][-]02/17/06 06:39 AM, ID: 15980939Author Comment

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[+][-]02/17/06 06:45 AM, ID: 15981013Author Comment

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[+][-]02/18/06 07:35 AM, ID: 15988827Author Comment

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